Collection

The Peace Palace Library has collected publications on international law since 1913. The collection of the Library now includes over a million volumes. A large part of this collection is searchable through the Peace Palace Library’s online catalogue.

Research guide

League of Nations

The League of Nations was the forerunner of the United Nations. It was established under the Treaty of Versailles, the peace treaty that formally ended World War I. The Treaty of Versailles was signed on 28 June 1919. Part I of the Versailles Treaty, i.e. the Covenant of the League of Nations, was the constitutional document of the League. According to this constitution, the League’s purpose was “to promote international co-operation and to achieve international peace and security”.